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Sony added nine more models in three series to its 4K TV range at the International CES show on Monday, promising cheaper offerings but not specifying prices.

The latest entries are led by the flagship XBR-X950B series, which was unveiled at a press conference at the Las Vegas Convention Center. The TV sets are expected to be available in spring this year in 85 and 65 inches and will feature direct LED local dimming.

The 4K Ultra HD TV has four times the resolution and clarity of Full HD 1080p, Triluminos display technology for enhanced color and detail, and HDMI 2.0.

"Its unique backlighting algorithm can achieve a much wider dynamic range of brightness with higher peaks and deeper blacks," said Mike Fasulo, president and chief operating officer of Sony Electronics. "These televisions are eye-catching no matter what you are viewing."

The flagship offering is followed by the X900B series in 79, 65, and 55 inches, and the X850B series in 70, 65, 55, and 49 inches. Sony is also adding a new line of five Bravia LED HD TV series to accompany the 4K entries. They will be mostly available this spring and some feature a wedge-shaped design with triangular sides and enhanced performance speakers.

The 4K push by Sony includes a new US$2,000 prosumer 4K camcorder, the FDR-AX100, a tie-up on 4K content with Netflix, whose CEO Reed Hastings appeared on stage with Sony officials, and the manufacturer's continued promotion of the Sony Video Unlimited 4K Service, announced last September with dozens of native 4K feature films.